106 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1912. 



2047. The origin of West African crossbows, by Henry Balfour. Pages 635-650, 

 with 1 plate. 



2048. Sanitation on farms, by Allen W. Freeman. Pages 651-0.77. 

 2040. Epidemiology of tuberculosis, by Robert Koch. Pages 659-674. 



The report of the executive committee and Proceedings of the 

 Board of Regents of the Institution, as well as the report of the 

 secretary, for the fiscal year ending June 30, 1911, both forming part 

 of the annual report of the Board of Regents to Congress, were pub- 

 lished in pamphlet form in December, 1911, as follows: 



2061. Report of the executive committee and Proceedings of the Board of 

 Regents for the year ending June 30, 1911. Pages 19. 



2065. Report of the secretary of the Smithsonian Institution for the year end- 

 ing June 30, 1911. Pages 91. 



The general appendix to the Smithsonian Report for 1911 was in 

 type, but actual presswork could not be completed before the close 

 of the fiscal year. In the general appendix are the following papers : 



The gyrostatic compass, by H. Marchand. 



Radiotelegraphy, by G. Marconi. 



Multiplex telephony and telegraphy by means of electric waves guided by wires, 

 by George O. Squier. 



Recent experiments with invisible light, by R. W. Wood. 



What electrochemistry is accomplishing, by Joseph W. Richards. 



Ancient and modern views regarding the chemical elements, by William 

 Ramsay. 



The fundamental properties of the elements, by Theodore William Richards. 



The production and identification of artificial precious stones, by Noel Heaton. 



The sterilization of drinking water by ultra-violet radiations, by Jules Cour- 

 mont. 



The legal time in various countries, by M. Philippot. 



Some recent interesting developments in astronomy, by J. S. Plaskett. 



The age of the earth, by J. Joly. 



International air map and aeronautical marks, by Ch. Lallemand. 



Geologic work of ants in tropical America, by J. C. Branner. 



On the value of the fossil floras of the arctic regions as evidence of geological 

 climates, by A. G. Nathorst. 



Recent advances in our knowledge of the production of light by living organ- 

 isms, by F. Alex. McDermott. 



Organic evolution ; Darwinian and de Vriesian, by N. C. Macnamara. 



Magnalia naturae: or the greater problems of biology, by D'Arcy Wentworth 

 Thompson. 



A history of certain great homed owls, by Charles R. Keyes. 



The passenger pigeon, by Pehr Kalni (1759), and John James Audubon (1831). 



Note on the iridescent colors of birds and insects, by A. Mallock. 



On the positions assumed by birds in flight, by Bentley Beetham. 



The garden of serpents, Butantan, Brazil, by S. Pozzi. 



Some useful native plants from New Mexico, by Paul C. Standley. 



The tree ferns of North America, by William R. Maxon. 



The value of ancient Mexican manuscripts in the study of the general develop- 

 ment of writing, by Alfred M. Tozzer. 



